Low frequency loudspeaker



FIG. 1 is a top plan view of the low frequency loudspeaker incorporating my new design;

FIG. 2 is a side elevational view of the loudspeaker of FIG. 1;

FIG. 3 is a front elevational view of the loudspeaker of FIG. 1; and

FIG. 4 is a rear elevational view of the loudspeaker of FIG. 1. 

The ornamental design for a low frequency loudspeaker, as shown. 